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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c0298a9b15355cf53f2cd283ecfd144a452d7c21ad2837e831c445ee6eb7d32' 
  AND token = 'CkSmNhs1gxyGDUAtBRgXCmSXJGq8A7+xzzEi9Gu4vDE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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