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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56bcdc1bc5dd518d1fad060565938e03f89a63a3968cfb7459b5ca4b693f3f60' 
  AND token = '+dCMW1xM33Chw9tFS+KuAQl6muYFb9wJD97+on0soFI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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