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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac862dd9d19b67c91f58f1ed53e812dbd0d7b2786f3e3d4f45bea9c748db1d2d' 
  AND token = 'l6zNdZq2i9M5ViubPH5t+WVwN/FauIoje0HOb1cOxKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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