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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2fe715ed2bbce8cad848fe6d3e4585a30a3fe76fcbcc572a95e0725d937e42f' 
  AND token = 'EJjhmf4e2vlanDnF9drhuD46c369PR+A2Ryg5BOM1xA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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