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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '183a201d890898df7690b77a4ff9e72ba5a0ac5ab6c853d87339209798f4ef38' 
  AND token = 'YWxIFi6yLm3VTxyQmvjbVeQeFlWhKSpwCttc/eBfR30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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