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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbb168ffd082c9e066c5b2ff81a6a2421859d7685a6c1a5819e92048957613cc' 
  AND token = '8zCaX8iU/rvTe0tVX0d52Oipoh+BFq8HoM7Kf7+c0VM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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