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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1706db66f073b9b1b2c34dc3a98680eb19edd47271ffa56c34f585bea6b4722' 
  AND token = 'nYVSH8Ui6oehHnoOOgTtqaSd6ab4m7c1yk12Vpargzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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