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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70c29fd4c7c5a844b97525d682e9ebe36457137394d7e09fac14d75416837738' 
  AND token = 'UZfBDEFknFGuZGiPHdV50E38k4g3C/Nr+1/scppWIrU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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