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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5f785b3b76085f9fc724418637e7afe1946d2d0145b960088237b43bc3990d5' 
  AND token = '+4EurPEB2hGc9VyNJ7bXt6mazQfoCYxpzdy3PC1yPys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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