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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f62a55a733b2c8199a2f86b5ec8718c9640a9451385a28ef6780b8937402314b' 
  AND token = 'VZiNv6A+DwMCsqRiPJCOdUkk8wNfHkTNrcwhfojpcFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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