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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '058f9ac09e423fbb3b11338f0a2af23f42a9259e26132fcc2549c35445755e56' 
  AND token = 'qYG6iFy2j5m47kuEF6Gkz1Mx+SX+emWZiCl7cmw7QBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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