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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a36ad8d1f4b09401631a85393a52b6d8d1970e89704a92253fb11de1b97851d' 
  AND token = 'O1t9ys89c8F4fRHQfcwBkNPtzD9HebkaS3RY8yLK0Jc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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