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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23fc2f1c3aa3731449d02c6ac3a24cb9ea0727291f21eef33efc2181cc31fdc6' 
  AND token = 'pBNf0GylYVf5XhikywfhuQTr3cXzkqSfqv9yD/g8RKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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