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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '386f2a10f48821c4dd332a4aefea24d91ea09a6b7a761b303f59c0df28ed0a05' 
  AND token = 'c9o1v8Ho2arHbb0q0bJuddirEwzLkIg+zgY09aDOVLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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