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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cebd199d59947e49dba4bae72571aa12b13109ba14478adc1cbf2932250ed48' 
  AND token = 'Iv9WIoli6hWyWzcHFHnS+eyE3NVBIiqKmu5tDbyVb50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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