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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f183afd0fcb848790f956fe3d1804d897bd71126150e359f8b313cac1cd7166' 
  AND token = '+v9LwbvDoxzSIWQl8cx3fKGC85Yqdm6CMFOVc0b1ANk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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