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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1141ef81385501da7c3332001dfe086cf9eb78981ecdd9c5033b8b6d381e99e9' 
  AND token = 'a3n8rtHyt1PC6dxhh6GJ61mwZWd9mm1dG1qI0jOHv/I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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