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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '336299c0cd0778ecd287daeab221fa1ee16737c03ae439763aa85f74b92bab2e' 
  AND token = 'TaSmdGDGFjfvsl1BJh5dzTq/umBc3fzj23BSavozNnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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