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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66cde336d0f041f780d6cbb9acd922673a0fc058b8b30b7fa9fd1cfd2120b19b' 
  AND token = 'eQzIDAXiVH+hxiR9sqn3X6I32/jjBq8Ke9kQrIxVw2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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