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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24331d4814ec23bd136720a77f8f8e02efe67e16fe3a60ed1dee57e3e2e33d75' 
  AND token = 'RgHtLC65xZgK7iMpWRlBvf18cdxVWoljZ2WTg50Ji3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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