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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a0694b61ff50cdb0b7ea28c0635eeb21b700eae9d787c04839d2d19f01a0c91' 
  AND token = 'KPukJimbAltomWw1uF+LI+FDb0lbQaQLwCl25CZU2/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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