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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aae8edb23a86aeb51333ac4b29934daa5d20f0c34efd9d641063a55f131f655' 
  AND token = 'C+tw3RJEf1J7cqnYZGlcC8HF++BJ+35XBNorCeDfdm0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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