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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c851bfb033cb673db1e4bd694c00b3527a4764632ad79425aec224ff691b9cc0' 
  AND token = '5Mge2BPOgU2iHLzCgPDtnYAECwIJxmgLatYS416DnDQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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