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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e757b7b6e78dc8d2be126a2b4da16944a994d9fffbe064892761e60fc96c0fef' 
  AND token = 'Jg3WTnjIfnR2zz/zvmEnDNHopnZiW0FptSv3zQQ31ZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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