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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0ea8a75ed05896df1f7253315227502332c4350e4eaa8cfd7a3364b42568841' 
  AND token = 'axx5hEBOoMK1Ilb9KACzKUk4Qj7M58kufq1+GeAtIvc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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