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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f019b37f5e811dff4f60e5cbdcbbd3a485e5cb90f3cf82a8ccca470edb022d03' 
  AND token = 'OcSKnIEZQnUt9RsuFxOb6PfCK5ZVyYGd2Npq7KWcIBU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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