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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '26e1a65fa38edfda18d23cea0ef1c40e18f3f234adc6cfb0f15e7f6a5d1a56ea' 
  AND token = 'qtHeaVwvCE6oRmFHfU0oIBs9jptDG7lY8Hwxby5OwyQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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