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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37937486b048f072753c149c0ee0372711f0aa136c03a41ea612482ae8df95ef' 
  AND token = 'GXwI0D7UIyza5M2ubvlqma+wNr02jvKmrhQK5ga8/w0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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