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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3830942743a18471af64862590df865926847e8b8eedb751723386f7a3ce6ac' 
  AND token = 'd4sq3HNMcFrvQRmKfRDkNT6CLP42Tue/S5o2gjzD5ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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