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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf86adf7558f0ff737a5b19da870d41c0984b02ccaddfbb3ed4b1f04a6b03c4c' 
  AND token = 'UH1MSwWmZoFDivojIFsH3pEusphyZURbEfpKARvsSy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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