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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5e2f005ebc982f08a42409e56e89003205818dcb958745a689ef9ef9cdfc7a9' 
  AND token = 'i4YM7DFlN2FY4PhoVEwNlphAnFk4EUF8dtDvf+pXy/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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