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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87389222dae3bbd9d1ead054ef0985b5d972333aaa98149eaa182291fd50b83e' 
  AND token = 'hboIKBG2nI8o2Hoxw4lELrujyuQDLuOi/xI3jwgkXPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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