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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a985b961e0b467617301d5bbec39e832724dd34ed0e4668d8ea437584ef4435e' 
  AND token = 'y74OJ1GwtDdbDpRRgvy5R3TE4TOA/0L5M6zKbaA7O8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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