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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd367b3d0fc0d883d7a6640ae5f7986ef2e0468cdd12ef10817098240580de6fe' 
  AND token = 'oRsXWYjs7/KGpqkhuPE6A/c6KeEOG8MNLXU7HFLuEvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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