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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee8050e30c2615d4437553a5607a44cb91742eda051e3f070147f2f66b3c143e' 
  AND token = 'QmKt0hQsAictSD/VSRBJAlQsx7Rao312awv0qYrAe6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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