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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8f27f47db4c6c068c492ed76dacc4389f619b95058b7346d043103ee9d77538' 
  AND token = 'ZzJ4fFKicPK3J5m3zdNpeMRL16wfp+AWj1Yk9ISmmJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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