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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5337293bfc36f9b2119d6b0b86316260e796d008316379ce7eb43c111a348ec' 
  AND token = 'pPnTH6hwyCzh4ts9tayS+sDXN+6a9eQNJeGY6HIidBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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