SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4eb1b6b26c7e210709df468e72104fd7a7ba58d1e8a0458314976ba3e29a0a5d' 
  AND token = 'V2jC03lYXygIYEqBFTQFQin1Vd9VCwLmMuNkrnp0Jxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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