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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e929ea01db0c3da88f2d9156ea98b0491584da43d3a05da4c6706a76fec5cd3' 
  AND token = 'ZpJFU9RyrOMqxRt92lVM1ohRoW7UmO7W8UlqCvW81SM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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