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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b0bb27bb4bf534975e915ca615ea70522dda9a06da22a61cf7f1a179eb0a487' 
  AND token = 'aPWhwVx3+Z2OOSWYVxAsBl1Mqwf99zaD8QauXeWK3q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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