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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d7cdd3e5dc771b4f49c568308b8870fde075d0add37341e56eb2f3e9b75a31e' 
  AND token = 'AlIlkl7EoUAcnn7E0f6U6Bz1M1CljqiPovvRww4BA+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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