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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34961197224b530ab153e4825e5800ba8d779238e60811cc0b440008b40b7da5' 
  AND token = '1ehYnOBD4QpdfZmz+DB+av4U7H4wXjDbq4T66S2fquA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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