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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8310f93b65e45f3c9d9e7a653146389241fcbcee9056bf67073a9e881b96bb9d' 
  AND token = '2XJOa8p7T7krc88eClbS6YaSUZIdrJkRpg8vWYGwAVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00012

JSON explain

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