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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aaad4542d28c5ab7125a3fee2a2de00245d11f6d61092223ec04486fb5b3932' 
  AND token = '6wgEIX3mcginDjWm+eLmSIAIssTqYZQ3P9XTjB7ey80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}