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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9dcb7a5ec936fae8e51685eeb679c1e98546b670c2c4f04e6d78576e8fbbd024' 
  AND token = 'rHHvM302NnLKlzHYOe1xHnO/U4kZj8bN6Y4z7aziwjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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