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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e876333c3f6c24bb45d50d68af1fb8bb82e8be8e5c99b09d7c3cbcf777d4f10d' 
  AND token = 'g2b1lpxxSH54M0fAy1RUK/zXyMEKN90lE3S0f1ujlR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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