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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f117e68bb20b459c7d8721e10045da23f080467d14da5301856d2bf80db556b' 
  AND token = 'cggiVy40EyDCeDA4XtoG/K2JKuudMAAH5lUS3oArYNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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