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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb32f70d597a855d387ce39d910ae988c344f7529127cf4e88d2f950daea015d' 
  AND token = 't+g/GxVdzYq3zs9NbdkLyTcED8f0G14J5s+Rz2Feok8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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