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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7a3193699eda6d6b560063ecc5c54b8cb68e6e7bdc5e42bf6f81d4d29bed63' 
  AND token = 'lb15ZqHwYMf0CjyN4FPZAH3aynCA+s/XQFG7AA3grQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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