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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db2a4c7c7465def3d47785337edf8a46faef2f0d8f6820ebdd3d13a77fa892c6' 
  AND token = 'WbDA6JzlFConPXT3aWfLWX7Ra2Vm2azDAwq/w/GyMT0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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