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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5f9d0ea97117b7ada82bdb5502b430d6f2415902bc571effeaa011575b13c6ae' 
  AND token = 'UCHXxtPElzDBCV6DZspDyDuQTU2emad8J1omNJL+PQE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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