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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec541c4a9125e6f17700ea40a88c979012e4484af5edd2c5e210e5026269465' 
  AND token = 'ySYwBNCcL/BqqoVpb0jWrcKKiny7fzamn+SiN67MAl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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