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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d8e07b18dc122fb882b980e84aa01f881aa57f1dc8e8fc1c1da905df0315ecd' 
  AND token = 'toG+jDRMXXbUTIcrTqUmkDeYoOulw3hrJ5o2opYJDjY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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