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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ee4e7d9eb6bc8ae0e7314173c1103a79213679918e181be1e0aa75c5c0a0a84' 
  AND token = 'ejjc6EZPjaqxdZ1+ijRjDNo7005DaP+1H/+SF/JVO2s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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