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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb7ab28b87837e6aa221cd7524a58c57a718369629a6232bc41f7e7c903df4a' 
  AND token = 'vg9ow4yTpRJl7Cmk03lZOwdREdf7RFlJ3+8UEpT4NIc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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