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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b3535b6f5e754260e8892872995e9cf1c25c90b6dc8e15dc51059821e35e28e' 
  AND token = 'KKZV8bPu7cbzprqTN0yQ7+KWlCdFgy0HWflhW+1N5Jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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