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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99be7d0f69bccd51245ca1995ea9a8c5deebb7c439bcaad9517d1d7a58d3f540' 
  AND token = '/tEn+8bGAtVsclTqXZwudmtwQbryvyoNCqxWkB6mzvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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