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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41daf1ef22d58a298eada8caaacb926074240199b83f8b2d1732a35519858f76' 
  AND token = 'XidMreF3HF4y3deh79oz1BCWqeirYbkyEJybr0z7zZ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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