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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92e1d1199a3b7d9061b98122f0ee35dcbf35c33142f85881ee1fe00c97015d35' 
  AND token = 'VmImuFAZm4AqAncsx4wz77lYF1LsuOIBeDYuKcLbm7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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