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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9861c9a5577a7eb9110d83a95fb305864143cf019d9b3495b09fd03813cdde3d' 
  AND token = '42hiqWnsR70bbacxv77fVOj2pig1u3LFu0lrfQvi/2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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