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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c8279d05fccf07ce7521141e90cf847d8af63d53e781852a67e0661141d3fec' 
  AND token = '3k7wJ3rbE4xaToUA1kr5tq26exWkZD/v/WnlSdgG/uM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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