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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83268ea4d9c5d06a020ac19e16413d7807ec008e0d7e6f683e5c87cc5116a777' 
  AND token = 'N9mA2+k39TRYVz/9H4+1zYW1juHf1PVHJBApAcQwii0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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