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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66315be09cdeb5732bc65bc7af49ddc33319deb22638a08183ff5ecca1dd9737' 
  AND token = '4KaPlsjB2x1qBr79uTzdbtFoin9AiPF6qflbkZ6GcTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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