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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77eda19c4d5c6139d3b3d54e7ca22cceba2bff9ae1430ede185c4140f83e5fed' 
  AND token = 'FPppL93i8F0v2lOfmj/ZYAIalRM66/QbgD4hYDCLrfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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