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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f535b2f4e5d917c617e2b115b98836f5f49b6abe3156be9686fc240a4bbf6a0' 
  AND token = 'FO2irTF61k4ogNhYGIv3n1fM9Ok37fEpW1o2eU9jKSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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