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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a687df7ba1032f8e8a2d037f48bb76bb620b17d71645af511dbf2a0e3d5976af' 
  AND token = 'IvNGZ4IAkSk3yFmWeB0PHPKgHA03USzRcrcf2h79UNQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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