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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cc111321ce49ac0e2e37cba72ff4836ef2bfd31c572a2ec9bcfd5a7e1c94d26' 
  AND token = 'ZMUuXen/ifeW7Lv1+5TiIvzSiPUdi3xdyCotwKPVG7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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