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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd911ff879093da951c42def0c216d1f97dba01228f77457d0c8d75205d17d2d3' 
  AND token = '3tBB5eHebqa7flcG6huiN8Y75gWIKGCmobtKg40lVsM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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