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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26cdb7da91aade7b1899db9492595f5f6952458adceaa07f6c013ae951fe7135' 
  AND token = 's3rqGAhVx+ZAu8lWe3SgJIWppyG3E+3V4e+Lg1f4+ZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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