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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdb1c7728beeafedec2ee672c5baad3b6ce54d04b965c94b288ab2c48548ffa8' 
  AND token = 'Qnt+ZTyU0oEdXEqbS/pohNcN/wwXDPuWzCr653PlcuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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