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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0f928872bacdb7047b21beb657d9597b05936df65176c2f4f9e8089b7e45c23' 
  AND token = 'JEj5P3X7ZOnJqTWM/14/sGYNS5aIb80RXLQ8r4pVKaU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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