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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccccdd7b2794b5701d2a6577742d5eb7ce6057ebd713453b5109f350aeba7394' 
  AND token = '8oNXCXaVlUSQnVwGtgPkO7ZX/V8XkuNCtFkYp+GXUGw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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