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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f63edca83e6e99315405a35413ec4ede9643fca31b98a732a9bf225469cf816' 
  AND token = 'YTVvK6C44rihLBwDJp7Enc4jnpovv8YM694x1lKyC0g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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