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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d608cfe297fae4718c0ea930446ea6687d888c70d6bc02004bd536c50056ad9' 
  AND token = 'F7qD3mNyWuEJr1C3LOXlWv7U+qMhf25IWCJ1/steIiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00122

JSON explain

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