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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2dd4964272d9061a789581751dbfe43624693eb6ae482ddb781e6f6dbabbcb7' 
  AND token = '67PKefN85KFNFvi9ue0BpArXu8hG4L/n8v45cO3gVJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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